From: Kuniyuki Iwashima kuniyu@amazon.com
[ Upstream commit 31e03207119a535d0b0e3b3a7f91983aeb2cb14d ]
gc_in_progress is changed under spin_lock(&unix_gc_lock), but wait_for_unix_gc() reads it locklessly.
Let's use READ_ONCE().
Fixes: 5f23b734963e ("net: Fix soft lockups/OOM issues w/ unix garbage collector") Signed-off-by: Kuniyuki Iwashima kuniyu@amazon.com Link: https://lore.kernel.org/r/20240123170856.41348-2-kuniyu@amazon.com Signed-off-by: Jakub Kicinski kuba@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- net/unix/garbage.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/net/unix/garbage.c b/net/unix/garbage.c index dc27635403932..9121a4d5436d5 100644 --- a/net/unix/garbage.c +++ b/net/unix/garbage.c @@ -198,7 +198,7 @@ void wait_for_unix_gc(void) if (READ_ONCE(unix_tot_inflight) > UNIX_INFLIGHT_TRIGGER_GC && !READ_ONCE(gc_in_progress)) unix_gc(); - wait_event(unix_gc_wait, gc_in_progress == false); + wait_event(unix_gc_wait, !READ_ONCE(gc_in_progress)); }
/* The external entry point: unix_gc() */